CN111073616B - Temporary plugging agent and application thereof - Google Patents
Temporary plugging agent and application thereof Download PDFInfo
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- CN111073616B CN111073616B CN201911308630.4A CN201911308630A CN111073616B CN 111073616 B CN111073616 B CN 111073616B CN 201911308630 A CN201911308630 A CN 201911308630A CN 111073616 B CN111073616 B CN 111073616B
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Abstract
The temporary plugging agent comprises the following components in parts by weight: 3-5 parts of a cutting agent, 15-25 parts of a fluid loss additive, 10-20 parts of calcium carbonate, 5-20 parts of a fiber material and 70-110 parts of shell powder; preferably, the shell powder is in a flake shape. The temporary plugging agent is applied to temporary plugging of a reservoir stratum, preferably, the temporary plugging agent is applied to temporary plugging of a large-scale fracture or karst cave reservoir stratum, and optionally, the dosage of the temporary plugging agent is 100-200kg of temporary plugging agent added in per cubic meter of water. The temporary plugging agent has the advantages of quick plugging, good effect, high acid solubility, easy plugging removal, low cost, small environmental pollution and high recovery rate of a reservoir stratum after acidification.
Description
Technical Field
The invention relates to a large-crack or karst-cave reservoir temporary plugging technology, in particular to a temporary plugging agent and application thereof.
Background
At present, the reservoir fracture plugging technology in China is still a technical problem, the conventional plugging technology is mostly aimed at non-reservoir sections, the physical and chemical method is usually adopted for plugging, the plugging mode is mainly used for plugging a leaking layer, but the plugging mode is not suitable for reservoir plugging. Aiming at the leakage prevention and stoppage of a reservoir section, on one hand, the plugging is required to be quickly formed, the pressure bearing capacity is high, the construction requirement is met, and on the other hand, an efficient removing method is adopted in the well completion trial production process, or the reservoir permeability recovery value is good after flowback.
The conventional reservoir fracture plugging methods are basically divided into two types: chemical methods and physical methods. The chemical mode is a gel type gel-breakable chemical plugging agent, and the plugging mode is that the plugging agent enters a leaking layer, fills and blocks the leaking stratum through the double functions of water absorption expansion, filling and compaction, and then releases the leaking stratum through gel breaking. The physical method is to block the lost stratum by the way of space bridging and stacking through the method of particle size grading by the acid-soluble material, and then put into production by the way of acidification removal, but the current reservoir plugging in China still has great difficulty, mainly has low bearing capacity or poor acidification removal effect.
Disclosure of Invention
The application provides a temporary plugging agent for a fractured reservoir, which can be bridged by multiple acid-soluble temporary plugging materials, improve the bearing capacity by adding fiber materials, ensure the plugging efficiency and be convenient for acidification removal after production.
The acid-soluble temporary plugging agent for the fractured reservoir can plug the fractured reservoir within 5mm and has good plugging capacity, pressure bearing capacity and acid solubility in the temporary plugging process of the reservoir.
In the present invention, a large fracture type reservoir refers to a large-gap, irregular-fracture-like reservoir and a fluid-percolating rock formation;
in the present invention, a karst cave type reservoir refers to an irregular karst cave shape reservoir and a formation percolating fluid. Both the cracks and the caverns are descriptions of the shape.
The application provides a temporary plugging agent, which comprises the following components in parts by weight:
3-5 parts of a cutting agent, 15-25 parts of a fluid loss additive, 10-50 parts of calcium carbonate, 5-20 parts of a fiber material and 70-110 parts of shell powder;
preferably, the temporary plugging agent comprises the following components in parts by weight: 3-5 parts of a cutting agent, 15-25 parts of a fluid loss additive, 10-15 parts of calcium carbonate, 5-15 parts of a fiber material and 80-90 parts of shell powder.
Preferably, the temporary plugging agent consists of the components described above.
In the temporary plugging agent provided by the invention, the shell powder is flaky.
In the temporary plugging agent provided by the invention, the shell powder comprises one or two of shell powder with the particle size of 1.68-3.35mm and shell powder with the particle size of 0.38-1.68 mm;
in the temporary plugging agent provided by the invention, optionally, the shell powder is formed by mixing medium shell powder with the particle size of 1.68-3.35mm and fine shell powder with the particle size of 0.38-1.68mm according to the weight ratio of (1-2) to (1-3);
in the temporary plugging agent provided by the invention, preferably, the shell powder is prepared by mixing medium shell powder with the particle size of 1.68-3.35mm and fine shell powder with the particle size of 0.38-1.68mm according to the weight ratio of 1.
In the temporary plugging agent provided by the invention, the shear strength improving agent is one or more of xanthan gum, high-viscosity carboxymethyl cellulose or guar gum.
In the temporary plugging agent provided by the invention, the fluid loss additive is modified starch.
In the temporary plugging agent provided by the invention, the modified starch is selected from carboxymethyl starch, hydroxypropyl starch, phenolated modified starch and sulfoalkylated starch.
In the temporary plugging agent provided by the invention, the fiber material is acid-soluble mineral fiber.
In the temporary plugging agent provided by the invention, optionally, the acid-soluble mineral fiber is magma fiber;
in the temporary plugging agent provided by the invention, the size of the fiber material is preferably 1-2mm, and the fiber diameter is preferably 1-2mm.
In another aspect, the invention provides the use of the temporary plugging agent in temporary plugging of a reservoir.
Preferably, the temporary plugging agent is applied to temporary plugging of a large-fracture type or karst cave type reservoir.
In the application of the temporary plugging agent in temporary plugging of a reservoir, the temporary plugging agent is mixed with water and then injected into a well, and the addition of the temporary plugging agent is 100-200kg per cubic meter of water.
The invention has the following beneficial effects:
the plugging agent is prepared into plugging liquid by drilling water or seawater and pumped into a shaft, and when plugging slurry enters a crack, bridging and particle filling are formed through reasonable particle size grading, so that a plugging zone with certain initial strength is formed quickly to plug a leak layer. The initial pressure bearing capacity can reach more than 5 MPa. Under the action of pressure, the sheet plugging agent is elastically deformed and is mutually connected with the fiber material to form a compact plugging layer, the compression strength can reach more than 20MPa, and the bearing capacity of the plugging layer is greatly improved. The acid solubility of the plugging zone can reach more than 90 percent, which is beneficial to acidification and plugging removal. Therefore, the plugging agent can be used for the treatment of large cracks of a producing zone and the plugging of a karst cave type reservoir stratum so as to achieve the purpose of protecting the producing zone, and can also be used for a non-producing zone so as to effectively reduce the leakage cost and improve the operation aging.
Meanwhile, the components of the plugging agent are natural materials (such as starch, calcium carbonate, shell powder and the like), so that the plugging agent is low in cost. Meanwhile, the plugging agent only contains a very small amount of polymers, so that the environmental pollution is small. Therefore, the plugging agent has the advantages of quick plugging, good effect, high acid dissolution rate, easy plugging removal, low cost and small environmental pollution.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application can be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Drawings
FIG. 1 is a pressure-time curve of a plugging test of the temporary plugging agent prepared in example 1.
FIG. 2 is a mass-time curve of a plugging test of the temporary plugging agent prepared in example 1.
FIG. 3 is a pressure-time curve of a plugging test of the temporary plugging agent prepared in example 2.
In FIG. 4, a is a plugging effect diagram of a 3 mm crack plate; b is a 5mm crack plate plugging effect diagram;
fig. 5 is a comparative diagram of an acid dissolution test of the temporary plugging agent prepared in example 1, wherein the left diagram is the temporary plugging agent, and the right diagram is a schematic diagram of the acid dissolution effect of the temporary plugging agent after 15wt.% hydrochloric acid is added, and the dissolution rate is above 90%.
FIG. 6 is a pressure-time curve of the plugging test of the temporary plugging agent prepared in comparative example 1.
FIG. 7 is a pressure-time curve of the plugging test of the temporary plugging agent prepared in comparative example 2.
FIG. 8 is a pressure-time curve of a plugging experiment for the temporary plugging agent prepared in comparative example 3.
FIG. 9 is a weight-time curve of the plugging test of the temporary plugging agent prepared in comparative example 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application are described in detail below. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The embodiment of the invention discloses a temporary plugging agent, which comprises the following components in parts by weight:
3-5 parts of a cutting agent, 15-25 parts of a fluid loss additive, 10-50 parts of calcium carbonate, 5-20 parts of a fiber material and 70-110 parts of shell powder;
preferably, the temporary plugging agent comprises the following components in parts by weight: 3-5 parts of a cutting agent, 15-25 parts of a fluid loss additive, 10-15 parts of calcium carbonate, 5-15 parts of a fiber material and 80-90 parts of shell powder.
Preferably, the temporary plugging agent consists of the components described above.
In the embodiment of the invention, the shell powder is in a sheet shape.
In the embodiment of the invention, the shell powder comprises one or two of shell powder with the particle size of 1.68-3.35mm and shell powder with the particle size of 0.38-1.68 mm;
in the embodiment of the invention, optionally, the shell powder is formed by mixing medium shell powder with the particle size of 1.68-3.35mm and fine shell powder with the particle size of 0.38-1.68mm according to the weight ratio of (1-2) to (1-3);
in the embodiment of the invention, preferably, the shell powder is prepared by mixing medium shell powder with the particle size of 1.68-3.35mm and fine shell powder with the particle size of 0.38-1.68mm according to the weight ratio of 1.
In embodiments of the invention, the shear enhancing agent is one or more of xanthan gum, high viscosity carboxymethyl cellulose, or guar gum.
In an embodiment of the invention, the fluid loss additive is a modified starch.
In an embodiment of the invention, the modified starch is selected from the group consisting of carboxymethyl starch, hydroxypropyl starch, phenolated modified starch and sulfoalkylated starch.
In an embodiment of the invention, the fibrous material is an acid-soluble mineral fiber.
In embodiments of the invention, optionally, the acid-soluble mineral fibers are magma fibers;
in the present embodiment, it is preferable that the fiber material has a size of 1 to 2mm and a fiber diameter of 1 to 2mm.
In another aspect, embodiments of the present invention provide an application of the temporary plugging agent described above in temporary plugging of a reservoir.
Preferably, the temporary plugging agent is applied to temporary plugging of a large-fracture type or karst cave type reservoir.
In the invention, the temporary plugging agent is mixed with water and then injected into a well, and the addition of the temporary plugging agent is 100-200kg of temporary plugging agent per cubic meter of water.
The starting materials used in the following examples are all commercially available.
In the embodiment of the invention, the extracting agent xanthan gum is purchased from Tianjin Zhonghai oil-consuming chemical Co., ltd, PF-EZVIS;
in the embodiment of the invention, the fluid loss additive is obtained from Tianjin Zhonghai oil-consuming chemical Co., ltd, PF-EZFOW, and is phenolized modified starch;
in the embodiment of the invention, the shell powder is purchased from mineral product processing factory in Lingshou county, hebei under the brand name of RF-FLAKE;
in the embodiment of the invention, the FIBER material is purchased from Tianjin Zhonghai oil and costume chemical Co., ltd, the brand is PF-FIBER, and the FIBER is prepared by rotating and extruding magma stones of which the main components are silicate after high-temperature melting.
In the examples of the present invention, the calcium carbonate was purchased from Tianjin Zhonghai oil chemical Co., ltd, and was named PF-EZCARB (particle size 5-15 μm).
Example 1
The temporary plugging agent prepared in example 1 uses the following raw materials in parts by weight:
3 parts of xanthan gum serving as a shear-improving agent, 15 parts of modified starch serving as a filtrate reducer, 10 parts of calcium carbonate, 10 parts of a fiber material and 90 parts of shell powder;
the shell powder is prepared by mixing medium shell powder with the particle size of 1.68-3.35mm and fine shell powder with the particle size of 0.38-1.68mm according to the weight ratio of 1.
The preparation method comprises the following steps:
the components in the formula ratio are added into a stirring device and uniformly stirred to obtain a powdery target product, wherein the adding sequence is not limited.
Example 2
The temporary plugging agent prepared in example 2 uses the following raw materials in parts by weight:
5 parts of xanthan gum serving as a shear-improving agent, 20 parts of modified starch serving as a filtrate reducer, 10 parts of calcium carbonate, 10 parts of a fiber material and 90 parts of shell powder;
the shell powder is prepared by mixing medium shell powder with the particle size of 1.68-3.35mm and fine shell powder with the particle size of 0.38-1.68mm according to the weight ratio of 1.
The preparation method comprises the following steps:
the components in the formula ratio are added into a stirring device and uniformly stirred to obtain a powdery target product, wherein the adding sequence is not limited.
Test example:
1. plugging capacity
1000 parts by weight of water was added to the temporary plugging agents prepared in examples 1 and 2 in the formulation ratio to conduct a 5mm seam plate plugging experiment.
The results of the measurements are shown in table 1, and b in fig. 1, 2, 3 and 4:
TABLE 1 detection results of blocking performance of 5mm seam plate of temporary blocking material of example
From the table above, it can be seen that the material has stable pressure bearing and small leakage amount under the condition of continuously pressurizing after the temporary plugging layer is formed. The temporary plugging agent provided by the embodiments 1 and 2 can completely plug cracks within a range of 5mm, has less filtration loss, can obviously improve the pressure bearing capacity of a stratum, has the maximum pressure bearing capacity of not less than 20MPa, and has stable plugging performance. The slit plate used in the laboratory experiment is not more than 15cm, and only a small amount of filtrate seeps out.
2. Acid solubility
The high acid solubility of the filter cake is the third greatest characteristic of the plugging agent of the present application. The acid solubility of the plugging agent of the embodiment of the application is measured, wherein the acid solubility measuring method refers to the acid insoluble measuring method in SY/T5559-92 'Universal test method for treating agent for drilling fluid'. The experimental data obtained are shown in table 2:
table 2: statistics of acid solubility experimental data
| Acid solubility (%) | |
| Example 1 | 94.1 |
| Example 2 | 93.5 |
As can be seen from the above table, the acid solubility of the temporary plugging agent in the embodiment of the present application is significantly higher than that of the conventional product, which indicates that the temporary plugging agent in the embodiment of the present application is more easily acidified and unplugged, and the reservoir protection effect is not affected.
3. In situ applications
The method has the advantages that the field quality situation of certain oil field is complex, severe complex situations such as creep shrinkage, collapse, high-pressure brine layer, well leakage and the like of a brine layer exist, particularly, the crack leakage of a target layer is very severe, the conventional leakage stopping schemes such as leakage stopping while drilling, bridge slurry leakage stopping and the like are adopted with little effect, the leakage stopping effect is ensured when the leakage stopping is carried out in the target layer, and an effective channel can be established in the oil extraction operation after well completion. In the block, the temporary plugging material for reservoir fractures (the formula is that 1000 parts by weight of water is added) in the embodiment 2 is adopted, so that the plugging problem in the reproduction of 40-year old wells in the oil field is successfully solved.
When a certain well of the oil field starts well workover operation, more oil gas is returned from the well, and the amount of the oil gas is 1.03g/cm 3 In the circulation process of the well killing fluid, the dynamic leakage rate is up to 25m 3 H, the static leak rate is up to 15m 3 H is used as the reference value. The temporary plugging slurry prepared in the embodiment 2 is adopted on site, and the leakage-stopping liquid is pumped into the temporary plugging slurry in an accumulative way for 8m 3 Observing and recording the discharge capacity, the pumping volume and the pumping pressure; standing for plugging for 1h after the replacement is in place, closely observing the liquid level of the shaft, intermittently filling the well killing fluid into the annulus, and measuring the static leakage to be 0.40m 3 H; closing the annular blowout preventer and the drilling tool circulation head, beating and pressing well fluid from the annular space by using a well cementation pump, stabilizing the pressure for 5min by one step at every 50psi, continuously increasing the pressure to 300psi, basically stabilizing the pressure, stabilizing the pressure for 30min, and accumulating the extrusion amount to be 0.45m 3 And measuring the dynamic leakage velocity of 1.8m in subsequent circulation 3 And h, the operation efficiency is greatly improved.
Comparative example 1
In comparative example 1, a base slurry was prepared according to a water, xanthan gum and starch weight ratio of 1000;
taking 1000 parts by weight of base slurry and 80 parts by weight of calcium carbonate, uniformly mixing, and simulating the temperature of a leakage stratum and the pressure during leakage stoppage by using a CDL-II high-temperature high-pressure leakage stoppage tester; the resulting pressure-time diagram is shown in fig. 6.
As can be seen from FIG. 6, when calcium carbonate is used as the main plugging material, the plugging effect is not good, and under the condition of 1MPa pressurization, the leakage rate is high, and the pressure cannot be maintained, which indicates that the plugging fails.
Comparative example 2
In comparative example 2, a base slurry was prepared with a water, xanthan gum and starch weight ratio of 1000;
taking 1000 parts by weight of basic slurry, 100 parts by weight of calcium carbonate and 30 parts by weight of PF-FIBER (magma FIBER), uniformly mixing, and simulating the temperature of a leakage stratum and the pressure during leakage stoppage by using a CDL-II high-temperature high-pressure leakage stoppage tester; the resulting pressure-time diagram is shown in fig. 7.
Fig. 7 shows that the leak stopping effect of the formulation in comparative example 2 is obviously improved compared with that of comparative example 1, but the pressure is low, so that the formulation cannot be used in actual production.
Comparative example 3
In comparative example 3, a base slurry was prepared according to a water, xanthan gum and starch weight ratio of 1000;
1000 parts by weight of base slurry, 100 parts by weight of shell powder and 20 parts by weight of calcium carbonate are taken. After the uniform mixing, a CDL-II high-temperature high-pressure plugging tester is used for simulating the temperature of the leaking stratum and the pressure during plugging; the resulting pressure-time diagram is shown in fig. 8 and the weight-time diagram is shown in fig. 9.
As can be seen from fig. 8 and 9, the system failed to form an effective plug when no fibrous material PF-FIBER was added.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the purpose of facilitating understanding of the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (10)
1. The temporary plugging agent consists of the following components in parts by weight:
3-5 parts of a cutting agent, 15-25 parts of a fluid loss additive, 10-50 parts of calcium carbonate, 5-20 parts of a fiber material and 70-110 parts of shell powder;
the shell powder is flaky;
the extracting and cutting agent is one or more of xanthan gum, high-viscosity carboxymethyl cellulose or guar gum;
the fluid loss additive is modified starch, and the modified starch is selected from carboxymethyl starch, hydroxypropyl starch, phenolated modified starch and sulfoalkylated starch;
the fibrous material is an acid-soluble mineral fiber.
2. The temporary plugging agent of claim 1, wherein said temporary plugging agent comprises the following components in parts by weight: 3-5 parts of a cutting agent, 15-25 parts of a fluid loss additive, 10-15 parts of calcium carbonate, 5-15 parts of a fiber material and 80-90 parts of shell powder.
3. The temporary plugging agent according to claim 1, wherein said shell powder comprises one or both of a shell powder having a particle size of 1.68-3.35mm and a shell powder having a particle size of 0.38-1.68 mm.
4. The temporary plugging agent according to claim 3, wherein said shell powder is a mixture of medium shell powder having a particle size of 1.68-3.35mm and fine shell powder having a particle size of 0.38-1.68mm in a weight ratio of (1-2) to (1-3).
5. The temporary plugging agent according to claim 4, wherein the shell powder is prepared by mixing medium shell powder with the particle size of 1.68-3.35mm and fine shell powder with the particle size of 0.38-1.68mm according to the weight ratio of 1.
6. The temporary plugging agent of claim 1, wherein said acid soluble mineral fibers are magma fibers.
7. The temporary plugging agent of claim 1, wherein said fibrous material has a diameter of 1-2mm.
8. Use of a temporary plugging agent according to any one of claims 1 to 7 for temporary plugging of a reservoir.
9. Use of the temporary plugging agent according to claim 8 in temporary plugging of a reservoir, wherein said use is of said temporary plugging agent in temporary plugging of a reservoir of the large fracture type or the karst cave type.
10. The use of the temporary plugging agent according to claim 8 or 9 in temporary plugging of a reservoir, wherein the temporary plugging agent is mixed with water and injected into a well, and the addition amount of the temporary plugging agent is 100-200kg of temporary plugging agent per cubic meter of water.
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| CN113390726B (en) * | 2021-06-10 | 2023-01-24 | 中国石油天然气股份有限公司 | Packer leakage plugging material, experimental method and device |
| CN115806809A (en) * | 2021-09-16 | 2023-03-17 | 天津凯夫特科技有限公司 | Pretreating agent and its treating method and use |
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